gdbus/mainloop.c

   1 /*
   2  *
   3  *  D-Bus helper library
   4  *
   5  *  Copyright (C) 2004-2011  Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <glib.h>
  29 #include <dbus/dbus.h>
  30
  31 #include "gdbus.h"
  32
  33 #define info(fmt...)
  34 #define error(fmt...)
  35 #define debug(fmt...)
  36
  37 struct timeout_handler {
  38         guint id;
  39         DBusTimeout *timeout;
  40 };
  41
  42 struct watch_info {
  43         guint id;
  44         DBusWatch *watch;
  45         DBusConnection *conn;
  46 };
  47
  48 struct disconnect_data {
  49         GDBusWatchFunction function;
  50         void *user_data;
  51 };
  52
  53 static gboolean disconnected_signal(DBusConnection *conn,
  54                                                 DBusMessage *msg, void *data)
  55 {
  56         struct disconnect_data *dc_data = data;
  57
  58         error("Got disconnected from the system message bus");
  59
  60         dc_data->function(conn, dc_data->user_data);
  61
  62         dbus_connection_unref(conn);
  63
  64         return TRUE;
  65 }
  66
  67 static gboolean message_dispatch(void *data)
  68 {
  69         DBusConnection *conn = data;
  70
  71         /* Dispatch messages */
  72         while (dbus_connection_dispatch(conn) == DBUS_DISPATCH_DATA_REMAINS);
  73
  74         dbus_connection_unref(conn);
  75
  76         return FALSE;
  77 }
  78
  79 static inline void queue_dispatch(DBusConnection *conn,
  80                                                 DBusDispatchStatus status)
  81 {
  82         if (status == DBUS_DISPATCH_DATA_REMAINS)
  83                 g_idle_add(message_dispatch, dbus_connection_ref(conn));
  84 }
  85
  86 static gboolean watch_func(GIOChannel *chan, GIOCondition cond, gpointer data)
  87 {
  88         struct watch_info *info = data;
  89         unsigned int flags = 0;
  90         DBusDispatchStatus status;
  91
  92         if (cond & G_IO_IN)  flags |= DBUS_WATCH_READABLE;
  93         if (cond & G_IO_OUT) flags |= DBUS_WATCH_WRITABLE;
  94         if (cond & G_IO_HUP) flags |= DBUS_WATCH_HANGUP;
  95         if (cond & G_IO_ERR) flags |= DBUS_WATCH_ERROR;
  96
  97         dbus_watch_handle(info->watch, flags);
  98
  99         status = dbus_connection_get_dispatch_status(info->conn);
 100         queue_dispatch(info->conn, status);
 101
 102         return TRUE;
 103 }
 104
 105 static void watch_info_free(void *data)
 106 {
 107         struct watch_info *info = data;
 108
 109         if (info->id > 0) {
 110                 g_source_remove(info->id);
 111                 info->id = 0;
 112         }
 113
 114         dbus_connection_unref(info->conn);
 115
 116         g_free(info);
 117 }
 118
 119 static dbus_bool_t add_watch(DBusWatch *watch, void *data)
 120 {
 121         DBusConnection *conn = data;
 122         GIOCondition cond = G_IO_HUP | G_IO_ERR;
 123         GIOChannel *chan;
 124         struct watch_info *info;
 125         unsigned int flags;
 126         int fd;
 127
 128         if (!dbus_watch_get_enabled(watch))
 129                 return TRUE;
 130
 131         info = g_new0(struct watch_info, 1);
 132
 133         fd = dbus_watch_get_unix_fd(watch);
 134         chan = g_io_channel_unix_new(fd);
 135
 136         info->watch = watch;
 137         info->conn = dbus_connection_ref(conn);
 138
 139         dbus_watch_set_data(watch, info, watch_info_free);
 140
 141         flags = dbus_watch_get_flags(watch);
 142
 143         if (flags & DBUS_WATCH_READABLE) cond |= G_IO_IN;
 144         if (flags & DBUS_WATCH_WRITABLE) cond |= G_IO_OUT;
 145
 146         info->id = g_io_add_watch(chan, cond, watch_func, info);
 147
 148         g_io_channel_unref(chan);
 149
 150         return TRUE;
 151 }
 152
 153 static void remove_watch(DBusWatch *watch, void *data)
 154 {
 155         if (dbus_watch_get_enabled(watch))
 156                 return;
 157
 158         /* will trigger watch_info_free() */
 159         dbus_watch_set_data(watch, NULL, NULL);
 160 }
 161
 162 static void watch_toggled(DBusWatch *watch, void *data)
 163 {
 164         /* Because we just exit on OOM, enable/disable is
 165          * no different from add/remove */
 166         if (dbus_watch_get_enabled(watch))
 167                 add_watch(watch, data);
 168         else
 169                 remove_watch(watch, data);
 170 }
 171
 172 static gboolean timeout_handler_dispatch(gpointer data)
 173 {
 174         struct timeout_handler *handler = data;
 175
 176         handler->id = 0;
 177
 178         /* if not enabled should not be polled by the main loop */
 179         if (!dbus_timeout_get_enabled(handler->timeout))
 180                 return FALSE;
 181
 182         dbus_timeout_handle(handler->timeout);
 183
 184         return FALSE;
 185 }
 186
 187 static void timeout_handler_free(void *data)
 188 {
 189         struct timeout_handler *handler = data;
 190
 191         if (handler->id > 0) {
 192                 g_source_remove(handler->id);
 193                 handler->id = 0;
 194         }
 195
 196         g_free(handler);
 197 }
 198
 199 static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data)
 200 {
 201         int interval = dbus_timeout_get_interval(timeout);
 202         struct timeout_handler *handler;
 203
 204         if (!dbus_timeout_get_enabled(timeout))
 205                 return TRUE;
 206
 207         handler = g_new0(struct timeout_handler, 1);
 208
 209         handler->timeout = timeout;
 210
 211         dbus_timeout_set_data(timeout, handler, timeout_handler_free);
 212
 213         handler->id = g_timeout_add(interval, timeout_handler_dispatch,
 214                                                                 handler);
 215
 216         return TRUE;
 217 }
 218
 219 static void remove_timeout(DBusTimeout *timeout, void *data)
 220 {
 221         /* will trigger timeout_handler_free() */
 222         dbus_timeout_set_data(timeout, NULL, NULL);
 223 }
 224
 225 static void timeout_toggled(DBusTimeout *timeout, void *data)
 226 {
 227         if (dbus_timeout_get_enabled(timeout))
 228                 add_timeout(timeout, data);
 229         else
 230                 remove_timeout(timeout, data);
 231 }
 232
 233 static void dispatch_status(DBusConnection *conn,
 234                                         DBusDispatchStatus status, void *data)
 235 {
 236         if (!dbus_connection_get_is_connected(conn))
 237                 return;
 238
 239         queue_dispatch(conn, status);
 240 }
 241
 242 static inline void setup_dbus_with_main_loop(DBusConnection *conn)
 243 {
 244         dbus_connection_set_watch_functions(conn, add_watch, remove_watch,
 245                                                 watch_toggled, conn, NULL);
 246
 247         dbus_connection_set_timeout_functions(conn, add_timeout, remove_timeout,
 248                                                 timeout_toggled, NULL, NULL);
 249
 250         dbus_connection_set_dispatch_status_function(conn, dispatch_status,
 251                                                                 NULL, NULL);
 252 }
 253
 254 static gboolean setup_bus(DBusConnection *conn, const char *name,
 255                                                 DBusError *error)
 256 {
 257         gboolean result;
 258         DBusDispatchStatus status;
 259
 260         if (name != NULL) {
 261                 result = g_dbus_request_name(conn, name, error);
 262
 263                 if (error != NULL) {
 264                         if (dbus_error_is_set(error) == TRUE)
 265                                 return FALSE;
 266                 }
 267
 268                 if (result == FALSE)
 269                         return FALSE;
 270         }
 271
 272         setup_dbus_with_main_loop(conn);
 273
 274         status = dbus_connection_get_dispatch_status(conn);
 275         queue_dispatch(conn, status);
 276
 277         return TRUE;
 278 }
 279
 280 DBusConnection *g_dbus_setup_bus(DBusBusType type, const char *name,
 281                                                         DBusError *error)
 282 {
 283         DBusConnection *conn;
 284
 285         conn = dbus_bus_get(type, error);
 286
 287         if (error != NULL) {
 288                 if (dbus_error_is_set(error) == TRUE)
 289                         return NULL;
 290         }
 291
 292         if (conn == NULL)
 293                 return NULL;
 294
 295         if (setup_bus(conn, name, error) == FALSE) {
 296                 dbus_connection_unref(conn);
 297                 return NULL;
 298         }
 299
 300         return conn;
 301 }
 302
 303 DBusConnection *g_dbus_setup_private(DBusBusType type, const char *name,
 304                                                         DBusError *error)
 305 {
 306         DBusConnection *conn;
 307
 308         conn = dbus_bus_get_private(type, error);
 309
 310         if (error != NULL) {
 311                 if (dbus_error_is_set(error) == TRUE)
 312                         return NULL;
 313         }
 314
 315         if (conn == NULL)
 316                 return NULL;
 317
 318         if (setup_bus(conn, name, error) == FALSE) {
 319                 dbus_connection_unref(conn);
 320                 return NULL;
 321         }
 322
 323         return conn;
 324 }
 325
 326 gboolean g_dbus_request_name(DBusConnection *connection, const char *name,
 327                                                         DBusError *error)
 328 {
 329         int result;
 330
 331         result = dbus_bus_request_name(connection, name,
 332                                         DBUS_NAME_FLAG_DO_NOT_QUEUE, error);
 333
 334         if (error != NULL) {
 335                 if (dbus_error_is_set(error) == TRUE)
 336                         return FALSE;
 337         }
 338
 339         if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
 340                 if (error != NULL)
 341                         dbus_set_error(error, name, "Name already in use");
 342
 343                 return FALSE;
 344         }
 345
 346         return TRUE;
 347 }
 348
 349 gboolean g_dbus_set_disconnect_function(DBusConnection *connection,
 350                                 GDBusWatchFunction function,
 351                                 void *user_data, DBusFreeFunction destroy)
 352 {
 353         struct disconnect_data *dc_data;
 354
 355         dc_data = g_new0(struct disconnect_data, 1);
 356
 357         dc_data->function = function;
 358         dc_data->user_data = user_data;
 359
 360         dbus_connection_set_exit_on_disconnect(connection, FALSE);
 361
 362         if (g_dbus_add_signal_watch(connection, NULL, NULL,
 363                                 DBUS_INTERFACE_LOCAL, "Disconnected",
 364                                 disconnected_signal, dc_data, g_free) == 0) {
 365                 error("Failed to add watch for D-Bus Disconnected signal");
 366                 g_free(dc_data);
 367                 return FALSE;
 368         }
 369
 370         return TRUE;
 371 }